Question 9

The resistivity of aluminum is 1.6 times that of copper. If an aluminum wire is twice as long as, and has half the cross-sectional area of, a copper wire, what is the ratio of the resistance of the aluminum wire to the resistance of the copper wire?

• A. 1.6
• B. 0.4
• C. 6.4
• D. 2.5
• E. 3.2
• F. Not close to any of the above

Formula Sheet

Question 8

Question 10

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